Humming vibration when accelerating (60mph+)

Interesting thing when driving on the highway. I experience a humming vibration in my floorboard when accelerating while at higher speeds, rpm in the 2500 range. Could be cruising at 60, 70, or 80 (rarely) but as soon as I apply throttle, same humming vibration. I can only assume its mounts or exhaust vibration (all brand new system OEM man. w/ magnaflow) but maybe someone can offer a 2nd opinion through their own experience

02 4x4 a/t reg cab @ 115k

 

My was front wheel bearings first passenger then driver side same humming sound middle to outside.